Crown D-75 Owners manual

@

urncro

20070

SERIAL ISSUED TO

NO.

CROWN

I}ISTRUCTIOI{

D-7

DUAL-CHANNEL

POWER

INTERNATIONAL

INC. 1718 MISHAWAKA RD., ELKHART.

AMPLIFIER

]||AI{UAI

5

IN 46514

crourn

D-75

TABLE OF CONTENTS

Section

I

General

Introduction

l.l

Purpose

1.2

1.3 Unpacking

1.4 Units and I

.5 Service

1.6 Glossary of

Murphy's Law ...........

1.7

2

Specifications and

2.1 General Specifications ................

2.2 Monaural Specifications

2.3 Stereo Specifications

3

Operation

General

3.I

Installation

3.2

Normal

3.3

Connecting Output

3.4

Mono Operation

3.5

3.6 Connecting

3.7 Connecting

The Protection Mechanisms ...........

3.8

3.9 Operating

Load Protection

3.10

Cleaning ................

3.1I

Information

Equipment ................

of

Accessories Supplies

Policies

Terms

Performance

(8

ohms)

and Installation

"Stereo"

Installation

Lines .........

Input Lines Power

Precautions

Methods

................

..........

................

.............

....................

.....................

............... l-3

..................

.............

....................

................... 3-l

............3-l

....................... 3-l

...................

....................... 3-3

............. 3-3

.....................

............. 3-5

.............. 3-5

...................

l-l l-l l-l l-l

... .. I - I

l-2

2-l 2-2 2-3

3-l

3-4

........ 3-6

3-l

Section

4

Principles of Operation

4.1

General

4.2 Principles of Operation

4.3 Block

Diagram

Circuit

Theory

..................4-l

.............

....................

4-l 4-l

Fig. l.l Fig.2.l Fig.2.2 Fig.2.3 Fig.2.4 Fig. 2.5 Fig. 2.6 Frg.2.7 Fig. 2.8 Fig.

3.1

Fig.

3.2 Fig. 3.3 Fig.

3.4 Fig. 3.5 Fig.3.6 Fig. 3.7 Fig. 3.8 Fig. 3.9 Fig. 3. l 0 Fig. 3.1 I

Fig. 3.l2 Fig. 4.1 Fig.4.2

LIST

Nominal Nominal Output Nominal Nominal Nominal Damping Factor Nominal Output Nominal Crosstalk Nominal

D-75

D-75 Source Schematic

D-75 Graph

Low-Pass

Modifying AC Mains

Fuse

Relay-Controlled Turn-On-Transient Muter for Load Protection

Normal Hi-Fi lnstallation ..........

D-75 Block Diagram

Frequency Response ................

Impedance ...................

Phase Response Power Efficiency

Phase Angle

Noise

Spectrum ............

Mounting Dimensions ............

Rear Panel

Resistance and

for Full Range Electrostatic Speaker Connection

Mono Hook-up

for

Selection of

Filters

Selector

.........

Damping Factor vs. Length

Input Capacitor

for Severe RF at

Voltage

Nomograph

Protector with

OF

............

for

ILLUSTRATIONS

lnputs

Loudspeaker Protection

Overload

................

Indicator

Size of Output Leads .........

and

2-4 2-4

........... 2-5

....................... 2-5

......................2-6

.................

...............

............

....................

.................... 3-4

................ 3-5

............... l-6

................... 3-6

............. 3-8

...........

2-6 2-7 2-7

...... 3-l

......... 3-2

........ 3-2

...... 3-3

......... 3-3

3-4

........ 3-7

4-2

crotun

D-75

SECTION 1

GENERAL

Introduction

l.l

purpose

The operational CROWN

manual is

the

reading

formance

read the CROWN warranty located inside Adherence to the

warranty will help

the

CROWN

Purpose of

1.2

D-75 is

The for the viding

minimum distortion, the unit

with puts,

signal capability from chassis

of this

characteristics

D-75

of the entire manual will ensure maximum

and

D-75

a compact, audio

professional

medium-power

presence

and a

ground.

1.3 Unpacking

manual is

power

amplifier.

divided

enjoyment. We

requirements

to assure

power

amplifier.

l.l

Fig.

to acquaint

maintenance

and

(Fig.

l.l) Even though

quick

for

reference,

suggest that at this time

and conditions set

your

satisfaction with the

D-75

Equipment

power-amplifier

well as the hi-fi enthusiast.

as

amplification

IOC indicators, monophonic

and

means for isolating electrical

from 20Hz-20KHz

features balanced in-

you

with the

of the

a

careful

the title

forth in

designed

ground

INFORMATION

recommends that

prove

be occasion to transport or ship the unit.

during

the warranty registration form is returned to the

factory to facilitate handling

warranty registration form

of

(See

enclosed brochure.)

Units and Accesories

comes

-

2 2 - fuses and fuseholders 2 proof

to the sophisticated circuitry, only a fully-trained,

technician should

amplifier.

panel.

per-

you

page.

Pro-

CROWN materials even They will there carton and the protection

WITHOUT THIS FACTORY

Be

sure CROWN need servicing. pleted

mailing

the Card.

1.4

The D-75

2

4 mounting screws

I Hi Fi kit which includes:

I

2 tapered locknuts

I - allen wrench

1.5 Service Policies

Due

competent

power

75 the rear

if

the unit arrives

valuable in

internal

transit. DO

promptness

Your

your

all-new,

complete

phone

to

dual banana

wire

of

cables

nuts

performance

Please

you

save the

perfect

in

preventing

pack

are specifically designed for

NOT SHIP THE

PACKI

in returning the comwill

personalized,

condition.

damage should

should

help

us

CROWN

Supplied

with instruction

and washers

plugs

sheet

be allowed to service the D-

observe the following label

manual

packing

Both

the

UNIT

the

unit

to hasten

Care

and:

on

Inspect the unit

was

D-75 unmarred. mediately initiate a claim

However, CROWN will cooperate

ment.

Be sure to save

event. the shipper's

for

any damage

carefully

Notify the transportation company

if any damage

inspected,

is found. Only the consignee

with the carrier for damage during ship-

the

carton as evidence

inspection.

incurred

tested and

in

transit.

Ieft the factory

fully

ofdamage

in

such an

The

im-

may

for

CAUTION:

ELECTRIC

TO

PREVENT

SHOCK. DO NOT

OPEN. NO

USER SERVICEABLE

PARTS INSIDE. REFER SERVICING TO

QT]ALIFIED

TECHNICIAN.

A

l-l

For service, return packing CROWN returned CROWN

replacement

or

factory.

to the factory oranapprovedwarrantystation.

pay

will

the unit to the factory

packing

For

warranty service,

shipping

all

obtainable

for warranty service. viced

costs

in the original Before

from the factory

the unit must be from

UPS or

returning a CROWN

for service,

the service

truck

unit by

UPS or truck

authorization should

manager. All shipments

freight.

The factory will return

power

D-75

freight.

amplifier

should be sent

to the

be obtained

your

ser-

1.6 Glossary

A-B Test:

Acoustic or Feedback: speakers are

Balanced

Bandpass

Biamp:

Channel:

lnput:

Filter: A

of Terms

Evaluating changing facilities.

Mechanical An annoying

Physically separating problem.

A three wire equal wire. The

between quencies

The use of speaker or crossover distortion.

A channel one channel. (A) both channels phonic

quickly

in magnitude but opposite

impedance

filter

that allows

given

outside this band.

independent amplifiers to loudspeakers with a crossover

is

right

and

system,

relative

input

a complete A stereophonic system

performance

from one to the other.

low frequency interference created when vibrations

picked

upper and lower cutoff values,

(B).

up by the

loudspeakers and

system where

of a balanced

transmission of alternating signals whose

sound

Monophonic material may be

will carry the same signal.

mixes and emerges as a

of two

cartridge

the voltages

polarity

in

path.

(or

more)

components or

Most high fidelity

and amplified by the sound system.

record-playing

and currents

with respect to

input is usually low.

while

substantially attenuating

feed

the bass and treble

network.

A

single channel, or

has

least two full

at

Stereo material, if

monophonic sound.

The

played

dealers

equipment

in two of the wires. are

ground

(600

purpose

monophonic system, has

channels

through a

systems

have A-B test

from loud-

will

solve

which is the third

ohms or

portions

designated as

played

less)

frequencies

of a

is to

eliminate

stereo

systeml

on a

by

the

are

all fre-

loud-

left

mono-

t-2

Channel

Corner

Crossover

Crosstalk:

Damping:

Separation:

Frequency:

Network:

Specified the opposite channel's

A frequency at uated to times referred fined as 3dB below the

The frequency lower frequency channels

A

selective

two or

woofer loudspeaker while the

dividing

Signal

Controlling of distortion.

in

dB, channel separation

input shorted.

which

"rolling

more bands of frequencies.

network

leakage

off' or attenuating

to

as the

which a dividing network delivers equal

at

network used to divide

and

from

vibrations, response, or

filter

the

"cutoffl'frequency

maximum output.

when

loudspeaker

one channel

is the measurable output of one channel with

goes

from a condition ofpassing the signal unatten-

the signal according to its

or the "break"

both are

The

high frequency band is fed to the tweeter.

into another.

terminated in specified

the

dividing

frequency output of an amplifier

audio

below the

band

network.

resonances which if unchecked

crossover

frequency. It is

frequency. It

power

to the

loads.

frequency is fed the

would

some-

is

also de-

upper

and

into

Also called

cause

cro

D-75

@

run

Damping

Decibel

Distortion:

Dynamic

Equalization:

Flutter:

Factor:

Range:

numerical

A movements. amplifier's

numerical expression of acoustic

A of a sound smallest change

Unwanted cording was tone and other

new tones caused

duces

non-linear

or its related overtones. tortion in degrees;

is

but

The difference

Frequency manipulation on

Rapid variation flutter causes a

indication of an amplifier's

Damping

output

or the

nolse,

made. Harmonic distortion

tones naturally

phase

measured

best

between the

manipulation to

factor

impedance.

relative

in sound

or sounds

playback

in

wavering of

strength

perceptible

mixing

by

shift, disturbs the

Transient distortion

transient distortion

phase

as

the speed

can

which didn't

most

meet the

to

musical

ability to decrease

found

be

or electrical

of a signal. One

the

to

exist

disturbs the original

related to it.

two or more original

of

natural timing sequence

are expressed

is

usuallyjudged

distortion.

least intense levels

the

and

requirements of recording,

get

uniform

of a turntable

response.

pitch.

unwanted

by dividing

ratios,

ear.

in

lntermodulation

or tape transport.

the load

such as

to three

the studio

decibels

tones. Phase distortion,

percentages; phase

in

from oscilloscope

known as compensation.

Also

loudspeaker

impedance by the

the relative

(d

when the original

relationship between a

distortion

between a

in a sound system.

When

intensity

B) is

about

(lM)

intro-

tone

patterns,

and an

inverse

pronounced,

the

re-

and dis-

Frequency

Gain:

Headroom:

Hertz:

Music Power:

IHF

Sensitivity:

Input

Murphy's

1.7

Throughout

Murphy.

Edsel

one broadest

scope

Response:

Law

the

design,

Mr. Murphy

Murphy's Law,

of

This term frequency. This

ratio

The

Stated

peak

As

This rating expresses peaks, putting peaks

The

production,

in

levels in a

in

cycles-per-second,

as opposed

out

(such

input voltage

and

(or

Murphy's

let's now offer a

indicates any amplitude

measurement

an amplifier's

of

headroom

dB,

program.

to sustained

45 watts

might occur

as

required

sale of

CROWN

Law) stated

the ability

if that level

small sample

is made

output

is the difference

rental agency.

not

power

is continuous, musical

in a

to drive an

products,

that,

variations

with

voltage

of an

levels.

consideration

"if

anything

of the application

in

the output

a constant

to its input signal.

between

amplifier to

passage),

amplifier

the

An

amplifier

but it

if the

to its fullest

go

can

with respect to

signal

input signal.

level

levels and the

average

handle short duration

may

has

wrong,

of the

sound

may only be capable

able to

be

peaks

been

it will." This being

law.

handle 60

not last too long.

do

rated output.

given

the effects of

to

(NOTE:

power

of

watt

the

CROWN

l-3

not

does

l. All warranty and

adhere

to these

below

guarantee

mention.a

clauses become

ru*rf

ZA$which

void upon

is

payment

mathematical

the

invoice.

of

symbol for

"hardly

ever."

2. Dimensions will furlongs

Identical units tested

3.

4. A

5. The

6. Interchangeable

7. Probabilityoffailureofacomponent,assembly,subsystem,orsystemisinverselyproportionaltoeaseofrepair or

8. If a circuit cannot

9. A

10. A transistor

I l. A

12. A inspection.

per

dropped

probability

replacement.

fail-safe

failure

purchased

will

always be expressed in the least

fortnight.

under identical conditions

tool will land

of a dimension

parts

won't.

fail.

circuit will

protected

not

component

destroy others.

by a fast-acting fuse

appear till

it will.

or

it

where

instrument

can do the most

being omitted from a

has

a unit

will

protect

will

passed

will meet its

final inspection.

usable terms.

not

be identical

damage.

plan

specs

(Also

or drawing

the fuse by

long

enough, and

Velocity,

in

the field.

known

is

directly

blowing first.

for

example, will

as the law

proportional

long

only

be expressed in

of selective

its

to

enough to

pass

gravitation.)

importance.

incoming

Manufacturer's

13. most

optimistic value. For

ln

14.

specifications, Murphy's Law

spec sheets will be incorrect

factor

by a

salesmen's claims these factors

supersedes Ohm's.

of 0.5 to 2.0,

depending on which multiplier

will be 0.1 or 10.0.

gives

the

l-4

crotun

D-75

SECTION 2.

SPECIFICATIONS/

2.1

General

Hum

Phase Response:

-

Input

Noise:

and

Impedance:

Amprifier output

Overall

Protection: AC

Specifications

From 20Hz - 20KHz

rated

the +

-15" 20Hz - 20KHz

l0o,

(XLR

balanced) 20,000 ohms

(XLR

unbalanced) 10,000 ohms

(phone

Protection:

I;l?ld::l::1iT

line fused. The

overall amplifier

internal resistance at the amplifier's inputs.

output.

jack

unbalanced) 25,000 ohms

#3"x"lJ#l'*,,T'ffii'"":'i,::;,ffir:Hii:; .",:::ilo"'

against RF

PERFORMANCE

the hum and

at I watt

controlled slewing

noise

+3070

+30%

burnout.

level below 175 microvolts is l06dB

+3070

rate

of the voltage amplifiers

Input overload

protection

below

protects

is furnished by

the

an

DC Output Offset:

Turn On:

Circuit:

Power Supply:

Power Requirements:

Power Consumption:

Heat Sinking:

Chassis:

Controls:

(shorted

Instantaneous, with minimum thump

A total of 42 transistors, I (dual

A specially designed low isolation and stability

ACvoltagesof 100, 120,200,220,and240volts+ l}/sataline-frequencybetween50 and

+15

The entire amplifier along

Aluminum-chassis construction weight.

Two input-level controls switch, located

input)

op-amp)

400H2 may be used.

watts while at idle, 120 watts at the

with the

millivolts.

tlO

8 signal

utilized in a wideband

are

profile

plus

is

used as a

chassis covers.

transformer, two

computer

heat

power

a

and

input

program

no

and

diodes

grade

for maximum heat

jacks,

zener diodes, 4 rectifiers and I linear lC

,2

multiple

filter

full rated

Front-panel

sink.

switch on the

on the rear

feedback loop design.

regulated

capacitors serve

output.

panel.

delay.

supplies

to

extrusion

conduction

panel.

front

for

complete

power

the D-75.

acts as a heat sink

minimum

and

A mono-stereo

2-l

Indicators:

2 IOC 2

indicators signal-presence power

I

indicator

(red) indicators

(amber)

(green)

Connectors,

Ground

Output:

Dimensions:

Weight:

Finish:

Input:

Link:

2.2 Monaural

(8

Output

Power

ohms): 95

(16

Cannon

nal) or

A means provided

ohms.

Color-coded

19" Iong, 9" Electric

l0

Satinized

t/n"

pounds

Specifications

watts minimum rated RMS sum total voltage.

ohm): 70 watts

rated RMS sum voltage.

3

phone

isolating or uniting

for

on the

binding

deep, and

standard

net

aluminum

minimum

connector

audio

jack.

rear

rack-mounting

weight.

front

RMS into

RMS into a l6

total harmonic distortion of 0.057o of

in which

panel.

The

posts

with

a

(8t7r"

high

l3/q"

panel

8 ohm load over a bandwidth of

an

harmonic distortion of 0.057o of the

chassis-ground

grounds

t/4"

stereo

deep

system

gray

with

load over a bandwidth of

ohm

positive,

2 is

from

or

are always

earphone

from mounting surface.)

is utilized.

suede

connected

jack

Lexan insert.

(for a positive

with electrical

internally by

the front

on

19" Western

A

20Hz-20KHzata

fundamental output

2OHz-20KHzata

the fundamental output

output

ground

panel.

sig-

is

2.7

Frequency

lKHz Power:

Harmonic

I.M.

Slewing

Damping

Output

Load

Voltage

Input Sensitivity:

Response:

Distortion:

Distortion: Less than 0.0570

Rate:

Factor: Greater than

Impedance:

lmpedance:

Gain:

+0.2d8

+

ldB 6Hz-50KHz,

watts RMS

80

Distortion)

Lessthan0.00l7afrom20[z-400HzandincreasinglinearlyIo0.05Voat2UKHzatlj

watts into l6 ohms.

to 70 watts

volts per

12

Less than 30

Rated for 8 and l6 ohm usage, safely drives loads.

+270

41.2

.8 12 volts

20Hz-20KHz,

into 16

microsecond.

400, DC-400H2 into 16 ohms.

milliohms in

32.3

@r

+2/6

I watt, 16 ohms.

I watt, l6 ohms.

ohms;

from

t0.2dB)

for 70 watts

0.01

ohms.

watts to 0.25

series

at

ll0 watts

maximum

into 16 ohms.

RMS into

watts,

and

with less than 6

any load

gain.

8 ohms,

less

microhenries.

(O.lToTotal

than0.0l7o

including

completely

Harmonic

from 0.25 watts

reactive

Output Signal:

'r-)

Balanced, not

cut out.

single

channel.

Channel I controls

are active, Channel

2 is inactive, but

Crown D-75 Owners manual

Specifications and Main Features

Frequently Asked Questions

User Manual